Industrial Noise and Hearing Loss
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概要
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The intensity and frequency of sound in varying workshops of a rubber plant were measured in order to study the influence of noises on the workers' hearing acuity. In addition, the effect of TATD (Neuvita), a conjugate of vitamin B1 and thiotic acid, was tested on the workers with hardness of hearing. The results obtained will be summarized as follows:1) Among the workshops making a noise exceeding 85 db., a processing workshop which showed a metalic and impinging sound (90-104 db.) with its peak at 2.5-3KC was evidenced to cause a typical and severe deafness.2) Ninety-five percent of 1, 076 workers in those workshops consisted of females; 78 percent of these being below 25 years of age and only 5 percent, over 31 years of age. Therefore, comparative studies could not be made on deafness by sex and age distinction. The ratio of male to female was also 5:95 on all workers of the plant.3) The deviation in hearing acuity at 4 KC of both ears was 0-10 db. in 254 of the 289 workers (88 percent) in the processing workshop, and this deviation was noted in 83 percent of 128 workers in other workshops with the loudness of sound exceeding 85 db. According to the expression of 0.5+(1×2)+4KC/4, this deviation in hearing acuity was found in as high as 97 percent of all workers. In any case, however, the degree of deviation in those occupational deafness was small. Besides, the hardness of hearing at 4 KC may have a great significance.4) TATD given to the processing workers with hardness of hearing, in daily doses of 10mg for 3 months, did not show any preventive or therapeutic effect. While, in those receiving TATD in daily doses of 150mg, however, the hearing acuity came to be improve after 1 month of treatment. After 3 months of such a treatment, the improvement was marked in those working for less than 5 years and was better than our expectation in those working for over 5 years.The development of occupational deafness can possibly be minimized, by taking adequate means such as the use of earplugs, reduction of working hours, transfer to a secure workshop, and in addition the use of drugs of this kind.
- 耳鼻咽喉科臨床学会の論文
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